试题与答案

(x-2x)n展开式中第2项和第6项的二项式系数相等,则展开式中的常数项是( )

题型:选择题

题目:

x
-
2
x
n展开式中第2项和第6项的二项式系数相等,则展开式中的常数项是(  )
A.60B.30C.-60D.15

答案:

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